Here is a list of top players in Big Data world having influence over billion dollars (or more) Big Data projects directly or indirectly (not in order):

Microsoft

Google

Amazon

IBM

HP

Oracle

VMWare

Terradata

EMC

Facebook

GE

Intel

Cloudera

SAS

10Gen

SAP

Hortonworks

MapR

Palantir

Splunk

The list is based on each above companies involvement in Big data directly or indirectly along with a direct product or not. All of above companies are involved in Big Data projects worth considering Billion+ …